Basic Electronics MCQ Questions and Answers

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Q21
A semi-conducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be
  • A A p-n junction
  • B An intrinsic semi-conductor
  • C A p-type semi-conductor
  • D An n-type semi-conductor
Answer: Option A
Q22
The transfer ratio beta of a transistor is 50. The input resistance of the transistor when used in the common emitter configuration is 1 kOhm. The peak value of the co current for an A.C. input voltage of 0.01 V peak is ?
  • A 100 microA
  • B 0.01 mA
  • C 0.25 mA
  • D 500 microA
Answer: Option D
Q23
The cause of the potential barrier in a p-n diode is ?
  • A Depletion of positive charges near the junction
  • B Concentration of positive charges near the junction
  • C Depletion of negative charges near the junction
  • D Concentration of positive and negative charges near the junction
Answer: Option D
Q24
In forward bias, the width of potential barrier in a p-n junction diode?
  • A increases
  • B decreases
  • C remains constant
  • D first increases then decreases
Answer: Option B
Q25
A depletion lay consists of?
  • A electrons
  • B protons
  • C mobile ions
  • D immobile ions
Answer: Option D
Q26
Which of the following when added acts as an impurity into silicon produced n-type semi conductor?
  • A P
  • B Al
  • C B
  • D Mg
Answer: Option A
Q27
In a junction diode, the holes are due to
  • A protons
  • B extra electrons
  • C neutrons
  • D missing electrons
Answer: Option D
Q28
The intrinsic semiconductor becomes an insulator at
  • A 0°C
  • B 0K
  • C 300K
  • D —100°C
Answer: Option B
Q29
The Keynesian theory of employment provides the solution of?
  • A Frictional unemployment
  • B Disguised unemployment
  • C Cyclical unemployment
  • D Seasonal unemployment
Answer: Option C

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